179 
15 ATRATI. 
Pods oblong to nearly linear, cartilaginous to coriaceous, 
rarely chartaceous, not inflated (a little so in A. atratus), varions- 
iy 2-celled by the intrusion of the dorsal suture, sulcate dorsally 
(except in the variety mensanus, rarely at all ventrally, with the 
cross-section round or nearly so),pod sessile or only minutely stip- 
itate, inclined to be wider above the middle, about 1.2-2.5 cin. 
long, rarely 5 mm, wide or high, opening first at tip, racemose, 
ventral suture the more arched and pod arcuate downward and 
seemingly upside down. Flowers short, rarely 1 cm. long, wide 
and stubby (not stubby in Panamintensis), white or greenish, sel- 
dom purpiish, with campanulate calyx and narrow teeth, on slen- 
der pedicels much longer than the bracis (flowers nearly sessile 
and bracts longer than the pedicels in A. obscurus). Bracts and 
stipules small, the latter not connate. Leaves narrow and with 
relatively elongated rachis tapering and rather rigid.. Leaflets 
few (rarely 7 pairs), narrow, mostly short, sub-alternate, distant, 
mostly much reduced above and inclined to abort. Stems, leaf- 
rachis and peduncles all green, Stems short and slender, with 
rather many very short internodes below and inclined to be ces- 
pitose (rarely somewhat elongated and with a few long internodes 
above), prostrate to decumbent, perennial, This group grows 
only in the Great Basin, Death Valley and southern edge of the 
Columbia Basin in arid places, rarely among grasses. 
KEY 
A. Pods cartilaginous when dry, fleshy when fresh, very oblique, 
mottled, widely spreading or a little retlexed. Proper stems almost 
none, caespitose, with stipules mostly overlapping. Flowers few. . 
136 Salmonis. 
2A. Pods not cartilaginous, mostly slightly y when fresh, near- 
ly straight, almost linear, rarely at all mottled. Some of the stems 
with long internodes. Leaflets mostly sharp. 
2AB. Stems slightly ifat all branched and not densely _ 
tangled. Peduncles conspicuous and elongated (except in A. 
Ibapensis). Flowers greenish-white, with mostly sharp keel. 
2ABC. Flowers and pods erect or ascending. Pedicels very 
short. Flowers in heads, or rarely spicate. 137 obscurus. 
2AB2C. Pods reflexed or pendent, opening along both su- 
tures. Flowers mostly reflexed. Pedicels elongated 
and slender and much longer than the short bracts. 
Flowers several, in long racemes. 138 atratus. 
Flowers 1-2 at the ends of filiform : 
peduncles shorter than the leaves. 139 Ibapensis. 
2A2B. Stems densely and intricately branched forming broad 
mats a few inches high. Peduncles hidden among the 
leaves. Flowers few, purple, not stubby. Pods oblong, tri- 
uetrous in cross-section, flat-apiculate, straight. E 
is i ; 140 Pana mintensis. 
